Role of submicron residual fillers in improving optical reflectance of barrier rib glasses for plasma display panels

Abstract

MgO, and cordierite) was investigated for application of the materials to barrier ribs of plasma display panels. The fillers were partially dissolved during sintering, yielding an increased local volume of the fillers in the submicron range, filler rearrangement along boundaries of sintered glass frits, and rather irregular and rugged filler shapes differing from the original morphologies. The measured optical reflectance of the various filler added specimens was within the 30-70% range, which was much higher than the predicted values (less than 10%) based on the rule of mixture of the refractive index. Here we report that the high reflectance of the barrier rib glass for plasma display panels is explained by light scattering by the increased submicron portion of the partially dissolved residual fillers, the size of which is similar to the visual spectrum range (0.4-0.7 m). The order of reflectance improvement among different types of filler-embedded specimens was consistent with that of the degree of dispersion of the residual fillers in the glass matrix.

Calcium Zinc Borosilicate Glass with High Thermal Expansion Coefficient for LTCC Applications

“…Therefore, the Appen constant of CTE is the effective CTE of an oxide when it is dissolved in glass network. The approach of tailoring the properties of glasses, based on and reported effective properties, was shown to be qualitatively valid in many existing works 6–10 . As the developed high CTE glass is aimed to be applied as a dielectric material, the dielectric constant of the glass has been also estimated and compared with the predicted value based on as reference data.…”

Thermophysical Properties of Ceramic Filler-Added BaO–ZnO–B2O3–P2O5 Glass Composites for Barrier Ribs of Plasma Display Panels

“…The formation of the ZnO second phase is observed only when TiO 2 is added, whereas the BaZn 2 (PO 4 ) 2 phase appears for the cases of Al 2 O 3 and ZnO filler additions as well. It is well known that various refractory ceramic fillers such as TiO 2 , Al 2 O 3 , ZrO 2 , MgO, and cordierite are partially dissolved in a low-melting glass such as barium zinc borosilicate glass [4][5][6][7]. Such partial dissolution of the fillers would also be the case herein in the BZBP glass matrix.…”

“…These deviations can be correlated to the formation of the second phase BaZn 2 (PO 4 ) 2 , which might possess a lower CTE than Al 2 O 3 , at 20 mass% addition of Al 2 O 3 . Since the amount of partially dissolved fillers increases as the filler addition increases [4][5][6][7], the increased alteration of the glass property at 20 mass% addition of TiO 2 and Al 2 O 3 would also contribute to deviations from the predictions.…”

“…Because of the deleterious influence of PbO on health and environment during processing, there has been much work to avoid the use of PbO constituents. Some of the notable alternative glasses are the recently reported BaO-ZnO-B 2 O 3 [3] and BaO-ZnO-B 2 O 3 -SiO 2 [4][5][6][7] systems.…”

Spectroscopic, Dielectric and Optical Properties of 60ZnO-30B2O3-10SiO2 Glass-Al2O3 Composites

“…The effect of SiO 2 on the thermal and dielectric properties of BaO–ZnO–B 2 O 3 has been studied by Kim et al 5 Various types of crystalline ceramic fillers were added to BaO–ZnO–B 2 O 3 –SiO 2 glass and the resultant dielectric constant, coefficient of thermal expansion and optical reflectance were investigated 6 . Shin et al 7 investigated the improvement of optical reflectance of the same glass by incorporating various fillers and explained it on the basis of scattering of light by the increased submicron portion of the partially dissolved residual fillers.…”